def demo(obj):
    print("原值：", obj)
    obj += obj
# 调用函数
print("=" * 10, "值传递", "=" * 10)
mot = "Hello Word" #不可变对象
print("函数调用前：", mot)
demo(mot) #调用函数
print("函数调用后：", mot)
print("=" * 10, "引用传递", "=" * 10)
list= ["钟离", "芙宁娜", "那维莱特"] #可变对象
print("函数调用前：", list)
demo(list) #调用函数
print("函数调用后：", list)